text based captchas strengths and weakness
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Text-based captchas strengths and weakness Elie Bursztein, Matthieu - PowerPoint PPT Presentation

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Text-based captchas strengths and weakness Elie Bursztein, Matthieu Martin, John Mitchell Stanford University 1 About this Research Presenter: Elie Bursztein (http://elie.im) Conference: ACM CCS 2011 Slides and paper freely

  1. Anti-recognition taxonomy Background Confusion Lines Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22 Background confusion

  2. Anti-recognition taxonomy Background Confusion Lines Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22 Background confusion

  3. Anti-recognition taxonomy Background Confusion Lines Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22 Background confusion

  4. Anti-recognition taxonomy Background Confusion Lines Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22 Background confusion

  5. Anti-recognition taxonomy Background Confusion Lines Collapsing Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22 Background confusion

  6. Anti-recognition taxonomy Background Confusion Lines Collapsing Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22 Background confusion

  7. Anti-recognition taxonomy Background Confusion Lines Collapsing Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22 Background confusion

  8. Anti-recognition taxonomy Background Confusion Lines Collapsing Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22 Background confusion

  9. Breaking World of Warcraft Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  10. Breaking World of Warcraft Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  11. Breaking World of Warcraft Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  12. Breaking World of Warcraft Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  13. Breaking World of Warcraft Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  14. Breaking Captcha.net Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  15. Breaking Captcha.net Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  16. Breaking Captcha.net Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  17. Breaking Captcha.net Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  18. Breaking Captcha.net Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  19. Breaking Wikipedia Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  20. Breaking Wikipedia Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  21. Breaking Wikipedia Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  22. Breaking Wikipedia Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  23. Breaking Wikipedia Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  24. Breaking Digg Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  25. Breaking Digg Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  26. Breaking Digg Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  27. Breaking Digg Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  28. Breaking Digg Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  29. Breaking Slashdot Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  30. Breaking Slashdot Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  31. Breaking Slashdot Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  32. Breaking Slashdot Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  33. Breaking Slashdot Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  34. Breaking eBay Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  35. Breaking eBay Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  36. Breaking eBay Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  37. Breaking eBay Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  38. Breaking eBay Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  39. Failing to break eBay Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  40. Failing to break eBay Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  41. Failing to break eBay Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  42. Failing to break eBay Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  43. Failing to break eBay Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  44. Breaking Baidu Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  45. Breaking Baidu Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  46. Breaking Baidu Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  47. Breaking Baidu Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  48. Breaking Baidu Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  49. Breaking Baidu Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  50. Real-world captchas security summary Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  51. Overall results Segmentation rate Solving rate Authorize 84% 66% Baidu 98% 5% Blizzard 75% 70% Captcha.net 96% 73% CNN 50% 16% Digg 86% 20% eBay 95% 43% Google 0% 0% MegaUpload n/a 93% NIH 87% 72% Recaptcha 0% 0% Reddit 71% 42% Skyrock 30% 2% Slashdot 52% 35% Wikipedia 57% 25% Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

  52. Learning rate for real schemes 90% Authorize Baidu Blizzard 80% Captcha.net CNN Digg 70% eBay Megaupload NIH 60% Reddit Skyrock Slashdot % success 50% Wikipedia 40% 30% 20% 10% 0% 10 20 50 100 200 500 Trainning set size Elie Bursztein, Matthieu Martin, John C. Mitchell Text-based CAPTCHAS strenghts and weaknesses http://ly.tl/p22

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